Fix clear of search

1 files changed, 3 insertions, 2 deletions

diff --git a/packages/gitbook-core/src/shapes/SummaryPart.js b/packages/gitbook-core/src/shapes/SummaryPart.js
index 75d5602..769ddd1 100644
--- a/packages/gitbook-core/src/shapes/SummaryPart.js
+++ b/packages/gitbook-core/src/shapes/SummaryPart.js
@@ -1,6 +1,7 @@
 const React  = require('react');
+const { listOf } = require('react-immutable-proptypes');
+
 const {
-    arrayOf,
     string,
     shape
 } = React.PropTypes;
@@ -9,5 +10,5 @@ const Article = require('./SummaryArticle');
 
 module.exports = shape({
     title: string.isRequired,
-    articles: arrayOf(Article)
+    articles: listOf(Article)
 });